<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box::after{
        content: attr(data-box);
        color:aqua;
    }
    .box::before{
        content: attr(data-oo);
        color: blue;
    }
</style>
<body>
    <div class="box" data-box="小兵" data-oo="大兵">
        boss
    </div>
</body>
</html>